It never ceases to amaze how many projects are developed making use of the RTL-SDR dongle. Bemasher has developed a software tool which interprets the signals in the 900 MHz ISM band sent from smart electric meters which are growing in popularity among utility companies.
This project is a proof of concept software defined radio receiver for these messages. We make use of an inexpensive RTL-SDR dongle to allow users to non-invasively record and analyze the commodity consumption of their household.
Currently the only known supported and tested meter is the Itron C1SR. However, the protocol is designed to be useful for several different commodities and should be capable of receiving messages from any ERT capable smart meter.